1
AIR PRESSURE STABILIZATION VENT
(57.15)
2.25
X
Z
Y
GENERAL DESCRIPTION
The Large Display is a versatile display available as a DC volt, current, or
process meter with scaling, serial communications and dual relay outputs. The 5
digit displays are available in either 2.25" or 4" high red LED digits with
adjustable display intensities. The 2.25" high models are readable up to 130 feet.
The 4" high models are readable up to 180 feet. Both versions are constructed
of a NEMA 4X/IP65 enclosure in light weight aluminum.
All models also come with dual Form C relay outputs and RS232 / RS485
serial communications.
SAFETY SUMMARY
All safety regulations, local codes and instructions that appear in this and
corresponding literature, or on equipment, must be observed to ensure personal
safety and to prevent damage to either the instrument or equipment connected to
it. If equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
ORDERING INFORMATION
MODEL NO. DESCRIPTION PART NUMBER
LD2A
2.25" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms
LD2A05P0
LD4A
4" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms
LD4A05P0
LD Plug Panel Meter Plug for LD models LDPLUG00
SPECIFICATIONS
1. DISPLAY: 5 digit, 2.25" (57 mm) or 4" (101 mm) intensity adjustable Red LED
(-99999 to 99999)
2. POWER REQUIREMENTS:
AC POWER: 50 to 250 VAC 50/60 Hz, 26 VA
DC POWER: 21.6 to 250 VDC, 11 W
DC Out: +24 VDC @ 100 mA if input voltage is greater than 50 VAC/VDC
+24 VDC @ 50 mA if input voltage is less than 50 VDC
Isolation: 2300 Vrms for 1 min. to all inputs and outputs
3. INPUT RANGES: Jumper Selectable
D.C. Voltages: 200 mV, 2 V, 20 V, 200 V, 10 V
D.C. Currents: 200 A, 2 mA, 20 mA, 200 mA
D.C. Process: 4 to 20 mA, 1 to 5 VDC, 0/1 to 10 VDC
4. OVERRANGE/UNDERRANGE INDICATION:
Input Overrange Indication: “
OLOL”.
Input Underrange Indication: “ULUL”.
Display Overrange/Underrange Indication: “.....”/“-.....”
2.25" & 4" HIGH RED LED DIGITS
PROGRAMMABLE SCALING AND DECIMAL POINTS
PROGRAMMABLE USER INPUT
DUAL 5 AMP FORM C RELAY
ALUMINUM NEMA 4X/IP65 CASE CONSTRUCTION
RS232/RS485 SERIAL COMMUNICATIONS
UNIVERSALLY POWERED
MODEL LD - LARGE DC VOLT/CURRENT/PROCESS DISPLAY
DIMENSIONS In inches (mm)
Bulletin No. LDA-D
Drawing No. LP0673
Released 09/10
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
www.redlion.net
CAUTION: Risk of Danger.
Read complete instructions prior to
installation and operation of the unit.
CAUTION: Risk of electric shock.
INPUT
RANGE
INPUT
IMPEDANCE
MAX
INPUT
SIGNAL
RESOLUTION
TEMP.
COEFFICIENT
200 mV 0.1% of span
1.027 M
75 VDC 10 μV 70 ppm /°C
2 V 0.1% of span
1.027 M
75 VDC 0.1 mV 70 ppm /°C
20 V 0.1% of span
1.027 M
250 VDC 1 mV 70 ppm /°C
10 V
200 V
0.1% of span
0.1% of span
538 K
1.027 M
30 V
250 VDC
1 mV
10 mV
70 ppm /°C
70 ppm /°C
ACCURACY @
23
C LESS
THAN 85% RH
INPUT
RANGE
INPUT
IMPEDANCE
MAX
INPUT
SIGNAL
RESOLUTION
TEMP.
COEFFICIENT
200 μΑ 0.1% of span
1.111 K
15 mA 10 nA 70 ppm /°C
2 mA 0.1% of span
111
50 mA 0.1 μA 70 ppm /°C
20 mA 0.1% of span
11
150 mA 1 μA 70 ppm /°C
200 mA 0.1% of span
1
500 mA 10 μA 70 ppm /°C
ACCURACY @
23
C LESS
THAN 85% RH
22 (558.8)
12 (304.3)
Z (Center)
7.875 (200)26 (660.4)LD4A05P0
4 (101.6)16 (406.4)LD2A05P0
Y (Height)X (Length)
PART
NUMBER
The protective conductor terminal is bonded to conductive
parts of the equipment for safety purposes and must be
connected to an external protective earthing system.
INPUT RANGE SELECT RANGE
4 - 20 mA Use the 20 mA range
1 - 5 VDC Use the 10V range
1 - 10 VDC Use the 10V range
C
C
US LISTED
US LISTED
U
L
R
51EB
IND. CONT. EQ.
C
US LISTED
U
L
R
3RSD
PROCESS CONTROL EQUIPMENT
2
5. A/D CONVERTER: 16 bit resolution
A/D Conversion Rate: 6 readings/sec.
6. DISPLAY RESPONSE TIME: 500 msec min.
7. USER INPUT:
Software selectable pull-up (8.6 K) or pull-down resistor
(3.9 K) that determines active high or active low input logic.
Trigger levels: V
IL
= 1.0 V max; V
IH
= 2.4 V min; V
MAX
= 28 VDC
Response Time: 5 msec typ.; 50 msec debounce (activation and release)
8. COMMUNICATIONS:
Type: RS485 or RS232
Isolation To Sensor & User Input Commons: 500 Vrms for 1 min.
Working Voltage: 50 V. Not Isolated from all other commons.
Data: 7/8 bits
Parity: no, odd or even
Baud Rate: 300 to 38.4 K
Bus Address: Selectable 0 to 99, Max. 32 meters per line (RS485)
9. MEMORY: Nonvolatile E
2
PROM retains all programming parameters and
max/min values when power is removed.
10. OUTPUT:
Type: Single FORM-C relay
Isolation To Sensor & User Input Commons: 1400 Vrms for 1 min.
Working Voltage: 150 Vrms
Contact Rating: 5 amps @ 120/240 VAC or 28 VDC (resistive load), 1/8
H.P. @ 120 VAC (inductive load)
Life Expectancy: 100,000 minimum operations
Response Time:
Turn On Time: 4 msec max.
Turn Off Time: 4 msec max.
11. ENVIRONMENTAL CONDITIONS:
Operating temperature: 0 to 65 °C
Storage temperature: -40 to 70 °C
Operating and storage humidity: 0 to 85% max. RH (non-condensing)
Vibration According to IEC 68-2-6: Operational 5 to 150 Hz, in X, Y, Z
direction for 1.5 hours, 2 g’s (1 g relay).
Shock According to IEC 68-2-27: Operational 30 g’s (10 g relay), 11 msec
in 3 directions.
Altitude: Up to 2,000 meters
12. CONNECTIONS:Internal removable terminal blocks
Wire Strip Length: 0.4" (10 mm)
Wire Gage: 24-12 AWG copper wire, 90°C rated insulation only
Torque: 5.3 inch-lbs (0.6 N-m) max.
Cable Diameter: Outside diameter must be 0.181" (4.6 mm) to 0.312" (7.9
mm) to maintain NEMA 4 rating of cord grips.
13. CONSTRUCTION: Aluminum enclosure, and steel side panels with textured
black polyurethane paint for scratch and corrosion resistance protection. Meets
NEMA 4X/IP65 specifications. Installation Category II, Pollution Degree 2.
14. CERTIFICATIONS AND COMPLIANCES:
SAFETY
UL Listed, File # E137808, UL508, CSA C22.2 No. 14-M95
File # E179259, UL61010-1, CAN/CSA C22.2 No. 61010-1
LISTED by Und. Lab. Inc. to U.S. and Canadian safety standards
Type 4X Enclosure rating, UL50
IECEE CB Scheme Test Report #E179259-A3-CB-1
Issued by Underwriters Laboratories, Inc.
IEC 61010-1, EN 61010-1: Safety requirements for electrical equipment
for measurement, control, and laboratory use, Part 1.
IP65 Enclosure rating, IEC 529
ELECTROMAGNETIC COMPATIBILITY
Emissions and Immunity to EN 61326: Electrical Equipment for Measurement,
Control and Laboratory use.
Notes:
1. Criterion A: Normal operation within specified limits.
2. Criterion B: Temporary loss of performance from which the unit self-
recovers.
15. WEIGHT:
LD2A05XX - 4.5 lbs (2.04 kg)
LD4A05XX - 10.5 lbs (4.76 kg)
1.0 INSTALLING THE METER
Class AEN 55011Emissions
0.5 cycle
Criterion AEN 61000-4-11
Emissions:
Voltage dip/interruptions
3 V/rms
Criterion BEN 61000-4-6RF conducted interference
1 kV L-L,
Criterion AEN 61000-4-5Surge
1 kV signal
2 kV power
Criterion BEN 61000-4-4Fast transients (burst)
2 kV L&N-E power
10 V/m
Criterion BEN 61000-4-3Electromagnetic RF fields
8 kV air discharge
4 kV contact discharge
Criterion BEN 61000-4-2Electrostatic discharge
Immunity to Industrial Locations:
INPUT RANGE JUMPER
This jumper is used to select the proper input range. The input range selected
in programming must match the jumper setting. Select a range that is high
enough to accommodate the maximum signal input to avoid overloads. To
access the jumper, remove the side cover of the meter.
Warning: Exposed line voltage exists on the circuit boards.
Remove all power to the meter and load circuits before accessing
inside of the meter.
2.0 SETTING THE JUMPERS
RANGE SELECT
654231
TBC
20 V/200 V
200 MV/2 V
10 V
200 µA
200 MA
20 MA
2 MA
INSTALLATION
The meter meets NEMA 4X/IP65 requirements when properly installed.
INSTALLATION ENVIRONMENT
The unit should be installed in a location that does not exceed the operating
temperature. Placing the unit near devices that generate excessive heat should
be avoided. The unit should only be cleaned with a soft cloth and neutral soap
product. Do NOT use solvents.
Continuous exposure to direct sunlight may accelerate the aging process of
the front overlay. Do not use tools of any kind (screwdrivers, pens, pencils, etc.)
to operate the keypad of the unit.
MOUNTING INSTRUCTIONS
This display is designed to
be wall mounted or
suspended from a ceiling
truss or other suitable
structure capable of
supporting the LDA.
Caution should be
exercised when hanging
the display to provide for
the safety of personnel. If
hanging the LDA, run the
suspension cables (or chains)
through the mounting bracket
holes. For wall mounting use
#10-32 size bolts.
MOUNTING HOLE (.281")
MUST BE
CONNECTED TO
TERMINAL #3 (TBA)
3
3.0 WIRING THE METER
EMC INSTALLATION GUIDELINES
Although this meter is designed with a high degree of immunity to Electro-
Magnetic Interference (EMI), proper installation and wiring methods must be
followed to ensure compatibility in each application. The type of the electrical
noise, source or coupling method into the meter may be different for various
installations. The meter becomes more immune to EMI with fewer I/O
connections. Cable length, routing, and shield termination are very important
and can mean the difference between a successful or troublesome installation.
Listed below are some EMC guidelines for successful installation in an
industrial environment.
1. The meter should be properly connected to protective earth.
2. Use shielded (screened) cables for all Signal and Control inputs. The shield
(screen) pigtail connection should be made as short as possible. The
connection point for the shield depends somewhat upon the application.
Listed below are the recommended methods of connecting the shield, in order
of their effectiveness.
a. Connect the shield only at the panel where the unit is mounted to earth
ground (protective earth).
b. Connect the shield to earth ground at both ends of the cable, usually when
the noise source frequency is above 1 MHz.
c. Connect the shield to common of the meter and leave the other end of the
shield unconnected and insulated from earth ground.
3. Never run Signal or Control cables in the same conduit or raceway with AC
power lines, conductors feeding motors, solenoids, SCR controls, and
heaters, etc. The cables should be ran in metal conduit that is properly
grounded. This is especially useful in applications where cable runs are long
and portable two-way radios are used in close proximity or if the installation
is near a commercial radio transmitter.
4. Signal or Control cables within an enclosure should be routed as far as
possible from contactors, control relays, transformers, and other noisy
components.
5. In extremely high EMI environments, the use of external EMI suppression
devices, such as ferrite suppression cores, is effective. Install them on Signal
and Control cables as close to the unit as possible. Loop the cable through the
core several times or use multiple cores on each cable for additional protection.
Install line filters on the power input cable to the unit to suppress power line
interference. Install them near the power entry point of the enclosure. The
following EMI suppression devices (or equivalent) are recommended:
Ferrite Suppression Cores for signal and control cables:
Fair-Rite # 0443167251 (RLC# FCOR0000)
TDK # ZCAT3035-1330A
Steward # 28B2029-0A0
Line Filters for input power cables:
Schaffner # FN610-1/07 (RLC# LFIL0000)
Schaffner # FN670-1.8/07
Corcom # 1 VR3
Note: Reference manufacturer's instructions when installing a line filter.
6. Long cable runs are more susceptible to EMI pickup than short cable runs.
Therefore, keep cable runs as short as possible.
7. Switching of inductive loads produces high EMI. Use of snubbers across
inductive loads suppresses EMI.
Snubber: RLC# SNUB0000.
WIRING OVERVIEW
Electrical connections are made via pluggable terminal blocks located inside
the meter. All conductors should conform to the meter's voltage and current
ratings. All cabling should conform to appropriate standards of good installation,
local codes and regulations. It is recommended that the power supplied to the
meter (DC or AC) be protected by a fuse or circuit breaker. When wiring the
meter, compare the numbers on the label on the back of the meter case against
those shown in wiring drawings for proper wire position. Strip the wire, leaving
approximately 0.4" (10 mm) bare lead exposed (stranded wires should be tinned
with solder.) Insert the lead under the correct screw clamp terminal and tighten
until the wire is secure. (Pull wire to verify tightness.) Each terminal can accept
up to one #14 AWG (2.55 mm) wire, two #18 AWG (1.02 mm), or four #20
AWG (0.61 mm). Use copper conductors only, with insulation rated at 90°C.
WIRING CONNECTIONS
Internal removable terminal
blocks are used for power and
signal wiring. Access to
terminal blocks is through
conduit fittings. Remove end
plates with ¼" nut driver. For
LD4 versions, all wiring is on
right side of unit. For LD2
versions, power and relay
wiring is on the right side and
the input, serial, DC out and
user input is on the left side.
Connect drain wire from
shielded cable(s) to screw on
side plate for proper grounding.
Front
TBA
321
Front
TBB
465132
TBC
TBD
31 2 4 56
RANGE SELECT
1 2345
LD2
Front
TBA
321
465321
TBB
RANGE SELECT
654231
TBC
53421
TBD
RIGHT SIDE VIEW LEFT SIDE VIEW
LD4
The power wiring is made via the 3 position terminal block (TBA) located
inside the unit (right side). The DC out power is located: LD2 - left side, LD4
- right side
3.1 POWER WIRING
USER COMM
+ EXC
6
4
TBC
DC Out Power
Terminal 4: + 24 VDC OUT
Terminal 6: User Common
Power
Terminal 1: VAC/DC +
Terminal 2: VAC/DC -
Terminal 3: Protective Conductor
Terminal
1
2
L1
L2
3
TBA
+
-
4
3.4 INPUT WIRING
3.2 USER INPUT WIRING
CAUTION: Analog common is NOT isolated from user input
common. In order to preserve the safety of the meter application,
the DC common must be suitably isolated from hazardous live
earth referenced voltage; or input common must be at protective
earth ground potential. If not, hazardous voltage may be present
at the User Input and Input Common terminals. Appropriate
considerations must then be given to the potential of the input
common with respect to earth ground. Always connect the
analog signal common to terminal 2.
The User Input is located: LD2 - left side, LD4 - right side
Terminal 5: User Input
Terminal 6: User Comm
3.3 SETPOINT (OUTPUT) WIRING
The setpoint relays use a six position terminal block (TBB) located inside the
(right side).
Terminal 1: NC 1
Terminal 2: NO 2
Terminal 3: Relay 1 Common
Terminal 4: NC 1
Terminal 5: NO 2
Terminal 6: Relay 2 Common
USER
5
USER COMM
6
TBC
USER
USER COMM
6
5
TBC
+
-
1
N.C. 1
COMM 1
3
2
N.O. 1
TBB
4
5
6
N.C. 2
N.O. 2
COMM 2
Sinking Logic Sourcing Logic
USER/EXC. COMMON
USER INPUT
VOLT INPUT
INPUT COMMON
CURRENT INPUT
+24 VDC EXC.
TBC
6
2
4
5
3
1
200 MV/2 V
200 µA
2 MA
20 MA
200 MA
20 V/200 V
10 V
Current Signal
(self powered)
Terminal 3: +ADC
Terminal 2: -ADC
Voltage Signal
(self powered)
Terminal 1: +VDC
Terminal 2: -VDC
Current Signal (2 wire
requiring excitation)
Terminal 4: +EXC
Terminal 3: +ADC
1 2
+
-
200 VDC MAX.
VOLT
ANALOG COMM
3.5 INPUT SIGNAL WIRING
Current Signal (3 wire
requiring excitation)
Terminal 3: +ADC (signal)
Terminal 2: -ADC (common)
Terminal 4: +EXC
Voltage Signal (3 wire
requiring excitation)
Terminal 1: +VDC (signal)
Terminal 2: -VDC (common)
Terminal 4: +EXC
Load
200 MA DC MAX.
ANALOG COMM
CURRENT
2
+
-
3
3 WIRE TRANSMITTER
VOLT
1
+ EXC.
ANALOG COMM
IoutVout
2
COMM
34
CURRENT
TRANSMITTER
-
+
+ EXC.
CURRENT
3
2 WIRE
4
Before connecting signal wires, the Input Range Jumper should be verified
for proper position.
RS232 Communications
RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data Terminal Equipment (DTE) transmits data on the Transmitted Data
(TXD) line and receives data on the Received Data (RXD) line. Data Computer
Equipment (DCE) receives data on the TXD line and transmits data on the RXD
line. The LD emulates a DTE. If the other device connected to the meter also
emulates a DTE, the TXD and RXD lines must be interchanged for
communications to take place. This is known as a null modem connection. Most
printers emulate a DCE device while most computers emulate a DTE device.
Some devices cannot accept more than two or three characters in succession
without a pause in between. In these cases, the meter employs a busy function.
As the meter begins to transmit data, the RXD line (RS232) is monitored to
determine if the receiving device is “busy”. The receiving device asserts that it
is busy by setting the RXD line to a space condition (logic 0). The meter then
suspends transmission until the RXD line is released by the receiving device.
RS485 Communications
The RS485 communication standard allows the connection of up to 32
devices on a single pair of wires, distances up to 4,000 ft. and data rates as high
as 10M baud (the LDA is limited to 38.4k baud). The same pair of wires is used
to both transmit and receive data. RS485 is therefore always half-duplex, that is,
data cannot be received and transmitted simultaneously.
3.6 SERIAL WIRING
TBD
A
COMM
RXD
TXD
4
2
3
1
B
5
232
485
5
LD METER RECEIVING DEVICE
+5V
4
47K
47K
3
B (-)
A (+)
COMM.*
Transmit
Enable
* OPTIONAL
Terminal Block Connection Figure
1
TXD
RXD
COMM.
LD METER (DTE)
RECEIVING DEVICE
2
RXD
TXD
3
32
75
5
DTE
3
2
DB9
2
3
DTEDCE
DB25DB25
Terminal Block Connection Figure
4.0 REVIEWING THE FRONT BUTTONS AND DISPLAY
BUTTON DISPLAY MODE OPERATION PROGRAMMING MODE OPERATION
PAR Access Programming Mode Store selected parameter and index to next parameter
RST
SEL
Resets display
Index display through selected displays
OPERATING MODE DISPLAY DESIGNATORS
MAX - Maximum display capture value
MIN
- Minimum display capture value
“1” - To the left of the display indicates setpoint 1 output activated.
“2” - To the left of the display indicates setpoint 2 output activated.
Pressing the SEL button toggles the meter through the selected displays. If display scroll is enabled, the display will toggle automatically every four seconds
between the enabled display values.
Advance through selection list/select digit position in
parameter value
Increment selected digit of parameter value
5
The serial connections are made via terminal block TBD located inside the
unit on the left side for the LD2 and on the right side for the LD4.
6
PROGRAMMING MODE ENTRY (PAR BUTTON)
It is recommended all programming changes be made off line, or before
installation. The meter normally operates in the Display Mode. No parameters
can be programmed in this mode. The Programming Mode is entered by
pressing the PAR button. If it is not accessible, then it is locked by either a
security code or a hardware lock.
MODULE ENTRY (SEL & PAR BUTTONS)
The Programming Menu is organized into five modules. These modules group
together parameters that are related in function. The display will alternate between
and the present module. The SEL button is used to select the desired
module. The displayed module is entered by pressing the PAR button.
MODULE MENU (PAR BUTTON)
Each module has a separate module menu (which is shown at the start of each
module discussion). The PAR button is pressed to advance to a particular
parameter to be changed, without changing the programming of preceding
parameters. After completing a module, the display will return to .
Programming may continue by accessing additional modules.
SELECTION / VALUE ENTRY
For each parameter, the display alternates between the present parameter and
the selections/value for that parameter. The SEL and RST buttons are used to
move through the selections/values for that parameter. Pressing the PAR button,
stores and activates the displayed selection/value. This also advances the meter to
the next parameter.
For numeric values, the value is displayed with one digit flashing (initially
the right most digit). Pressing the RST button increments the digit by one or
the user can hold the RST button and the digit will automatically scroll. The
SEL button will select the next digit to the left. Pressing the PAR button will
enter the value and move to the next parameter.
PROGRAMMING MODE EXIT (PAR BUTTON)
The Programming Mode is exited by pressing the PAR button with Pro NO
displayed. This will commit any stored parameter changes to memory and
return the meter to the Display Mode. (If power loss occurs before returning to
the Display Mode, verify recent parameter changes.)
PROGRAMMING TIPS
It is recommended to start with Module 1 and proceed through each module in
sequence. When programming is complete, it is recommended to record the
parameter programming and lock out parameter programming with the user input
or programming security code.
FACTORY SETTINGS
Factory Settings may be completely restored in Module 2. This is useful
when encountering programming problems.
ALTERNATING SELECTION DISPLAY
In the explanation of the modules, the following dual display with arrows will
appear. This is used to illustrate the display alternating between the parameter
on top and the parameter’s Factory Setting on the bottom. In most cases,
selections and values for the parameter will be listed on the right.
Indicates Program Mode Alternating Display
Factory Settings are shown.
Parameter
Selection/Value
N0
USrIN
5.0 PROGRAMMING THE METER
Parameters
Output
Setpoint
Parameters
Signal Input
Pro
DISPLAY
MODE
Panel Key
Function
Parameters
3-dSP
Parameters
Display and Front
NO
PAR
RST
PAR PAR PAR PAR
2-SEC
1-INP
4-SPt
5-SEr
PAR
Serial
Setup
Parameters
Secondary
OVERVIEW
PROGRAMMING MENU
Display
Decimal
Point
Filter
Setting
Filter
Band
Input Value
for Scaling
Point 1
Display Value
For Scaling
Point 1
User Input
Assignment
Input
Range
PAR
rANGE
dECPt
FILtr
bANd
INP 1
dSP 1
INP 2
U-ASN
1-INP
Pro
User Input
Function
dSP 2
USrIN
Input Value
for Scaling
Point 2
Display Value
For Scaling
Point 2
StYLE
Scaling
Style
OFSEt
Display
Offset
Value
U-Act
User Input
Active Level
5.1 MODULE 1 - SIGNAL INPUT PARAMETERS (1-INP)
PARAMETER MENU
200v
rAN6E
INPUT RANGE
Select the input range that corresponds to the external signal. This selection
should be high enough to avoid input signal overload but low enough for the
desired input resolution. This selection and the position of the Input Range
Jumper must match.
200uA
200.00 A
10u
2u
0.2u
0.002A
10.000 V
2.0000 V
200.00 mV
2.0000 mA
20.000 mA
200.00 V
20.000 V
200.00 mA
0.02A
200u
20u
0.2A
SELECTION
RANGE
RESOLUTION
RANGE
RESOLUTION
SELECTION
0.00
dECPt
0.000 0.00000.000.00
DISPLAY DECIMAL POINT
Select the decimal point location for the Input, MIN and MAX displays. This
selection also affects the dSP1 and dSP2 parameters and setpoint values and offset value.
0.00
OFSEt
DISPLAY OFFSET VALUE
The display can be corrected with an offset value. This can be used to
compensate for signal variations or sensor errors. This value is automatically
-19999 to 19999
7
100.00
dSP 2
DISPLAY VALUE FOR SCALING POINT 2
-19999 to 99999
Enter the second Display Value by using the front panel buttons. This is the
same for KEY and APLY scaling styles. The decimal point follows the dECPt
selection.
General Notes on Scaling
1. When using the Apply (APLY) scaling style, input values for scaling points
must be confined to the range limits shown.
2. The same Input Value should not correspond to more than one Display Value.
(Example: 20 mA can not equal 0 and 20.)
3. For input levels beyond the programmed Input Values, the meter extends the
Display Value by calculating the slope from the two coordinate pairs (INP1 /
dSP1 & INP2 / dSP2).
USER INPUT ASSIGNMENT
Select the value(s) to which the User Input Function is assigned. The User
Input Assignment only applies if a selection of reset, display hold, or print and
reset is selected in the User Input Function menu.
MODEDISPLAY
No Function
NO
DESCRIPTION
User Input disabled.
Program Mode Lock-out
P-Loc
Zero Input
(Edge triggered)
ZErO
Zero the Input Display value causing
Display Reading to be Offset.
d-SEL
d-LEV
d-HLd
rESEt
Resets the assigned value(s) to the current
input value.
HI-LO HI
dSPLO
See Programming Mode Access chart
(Module 3).
Setpoint 1 and 2 Reset
Setpoint 1 Reset
Setpoint 2 Reset
Print and Reset
Reset both setpoint 1 and 2 outputs.
Resets setpoint 1 output.
Resets setpoint 2 output.
Same as Print Request followed by a
momentary reset of the assigned value(s).
rSt12
rSt-1
rSt-2
P-r5t
Print Request
Serial transmit of the active parameters
selected in the Print Options menu
(Module 5).
Print
USER INPUT FUNCTION
NO
USrIN
dSP
U-ASN
Display Select
(Edge Triggered)
Display Intensity Level
(Edge Triggered)
Display Hold
Reset (Edge triggered)
Advance once for each activation.
Increase intensity one level for each
activation.
Holds the assigned display, but all other
meter functions continue as long as
activated (maintained action).
KEy
StYLE
SCALING STYLE
If Input Values and corresponding Display Values are known, the Key-in
(KEY) scaling style can be used. This allows scaling without the presence or
changing of the input signal. If Input Values have to be derived from the actual
input signal source or simulator, the Apply (APLY) scaling style must be used.
KEy APLY
0.00
INP 1
INPUT VALUE FOR SCALING POINT 1
For Key-in (KEY) style, enter the first Input Value using the front panel buttons.
(The Input Range selection sets the decimal location for the Input Value).
For Apply (APLY) style, the meter shows the previously stored Input Value. To
retain this value, press the SEL button to advance to the next parameter. To
change the Input Value, press the
RST button and apply the input signal to the
meter. Adjust the signal source externally until the desired Input Value appears.
Press the SEL button to enter the value being displayed.
0 to 29999
0.00
dSP 1
DISPLAY VALUE FOR SCALING POINT 1
-19999 to 99999
Enter the first Display Value by using the front panel buttons. This is the same
for KEY and APLY scaling styles. The decimal point follows the dECPt selection.
100.00
INP 2
INPUT VALUE FOR SCALING POINT 2
0 to 29999
For Key-in (KEY) style, enter the known second Input Value using the front
panel buttons.
For Apply (APLY) style, the meter shows the previously stored Input Value for
Scaling Point 2. To retain this value, press the SEL button to advance to the
next parameter. To change the Input Value, press the RST button and apply the
input signal to the meter. Adjust the signal source externally until the desired
Input Value appears. Press the SEL button to enter the value being displayed.
LO
U-Act
USER INPUT ACTIVE LEVEL
Select whether the user input is configured as active low or active high.
1
FILtr
FILTER SETTING
If the displayed value is difficult to read due to small process variations or
noise, increased levels of filtering will help to stabilize the display. Software
filtering effectively combines a fraction of the current input reading with a
fraction of the previous displayed reading to generate the new display.
Filter values represent no filtering (0), up to heavy filtering (3). A value of 1
for the filter uses 1/4 of the new input and 3/4 of the previous display to generate
the new display. A filter value of 2 uses 1/8 new and 7/8 previous. A filter value
of 3 uses 1/16 new and 15/16 previous.
0,1 2 3
10
bANd
FILTER BAND
The filter will adapt to variations in the input signal. When the variation
exceeds the input filter band value, the filter disengages. When the variation
becomes less than the band value, the filter engages again. This allows for a
stable readout, but permits the display to settle rapidly after a large process
change. The value of the band is in display units, independent of the Display
Decimal Point position. A band setting of ‘0’ keeps the filter permanently
engaged at the filter level selected above.
0 to 199 display units
updated after a Zero Display to show how far the display is offset. A value of
zero removes the effects of offset. The decimal point follows the dECPt selection.
LO HI
8
Entering Code 66 will overwrite all user settings with
the factory settings. The meter will display rESEt and then
return to
CodE 00. Press the PAR button to exit the module.
MIN DISPLAY ENABLE
YESNO
NO
LO-En
NO
FCS
2.0
LO-t
MIN CAPTURE DELAY TIME
When the Input Display is below the present MIN value for the entered delay
time, the meter will capture that display value as the new MIN reading. A delay
time helps to avoid false captures of sudden short spikes.
0.0 to 999.9 seconds
Select yES to perform either of the Factory Service Operations shown below.
FACTORY SERVICE OPERATIONS
yESNO
Enables the Minimum Display Capture capability.
The LD uses stored calibration values to provide accurate
measurements. Over time, the electrical characteristics of
the components inside the LD will slowly change with the
result that the stored calibration values no longer accurately
define the input circuit. For most applications, recalibration
every 1 to 2 years should be sufficient.
Calibration of the LD involves a calibration which should only be performed
by individuals experienced in calibrating electronic equipment. Allow 30 minute
warm up before performing any calibration related procedure. The following
procedures should be performed at an ambient temperature of 15 to 35 °C (59 to
95 °F).
CAUTION: The accuracy of the calibration equipment will directly affect the
accuracy of the LD.
Current Calibration
1. Connect the negative lead of a precision DC current source with an accuracy
of 0.01% or better to the COMM terminal. Leave the positive lead of the DC
current source unconnected.
2. With the display at CodE 48, press the PAR button. Unit will display CAL NO
3. Press the RST button to select the range to be calibrated.
4. Press the PAR button. Display reads 0.0A
5. With the positive lead of the DC current source unconnected, press PAR.
Display reads CALC for about 8 seconds.
6. When the display reads the selected range, connect the positive lead of the DC
current source to the current input and apply full-scale input signal for the
range. (Note: For 200 mA range, apply 100 mA as indicated on the display.)
Press PAR. Display reads CALC for about 8 seconds.
7. Repeat steps 3 through 6 for each input range to be calibrated. When display
reads CAL NO, press the PAR button to exit calibration.
Voltage Calibration
1. Connect a precision DC voltage source with an accuracy of 0.01% or better
to the volt input and COMM terminals of the LD. Set the output of the voltage
source to zero.
2. With the display at
CodE 48, press the PAR button. Unit will display CAL NO.
3. Press the RST button to select the range to be calibrated.
4. Press the PAR button. Display reads 0.0v.
5. With the voltage source set to zero (or a dead short applied to the input), press
PAR. Display reads CALC for about 8 seconds.
6. When the display reads the selected range, apply full-scale input signal for the
range. (Note: For 200V range, apply 100V as indicated on the display.) Press
PAR. Display reads CALC for about 8 seconds.
7. Repeat steps 3 through 6 for each input range to be calibrated. When display
reads CAL NO, press the PAR button to exit calibration
CALIBRATION
66
CodE
RESTORE FACTORY DEFAULT SETTINGS
Entering Code 50 will display the model (LDA) and
version (x.x) of the meter. The display then returns to
CodE 00. Press the PAR button to exit the module.
50
CodE
VIEW MODEL AND VERSION DISPLAY
48
CodE
5.2 MODULE 2 - SECONDARY FUNCTION PARAMETERS (2-SEC)
PAR
Max Capture
Delay Time
Max Display
Enable
Min Display
Enable
Access Code
For Service
Operations
Min Capture
Delay TIme
Factory
Service
Operations
2-SEC
HI-En HI-t
LO-En LO-t FCS
CodE
Pro
PARAMETER MENU
2.0
HI-t
MAX CAPTURE DELAY TIME
When the Input Display is above the present MAX value for the entered
delay time, the meter will capture that display value as the new MAX reading.
A delay time helps to avoid false captures of sudden short spikes.
0.0 to 999.9 seconds
NO
HI-En
MAX DISPLAY ENABLE
YESNO
Enables the Maximum Display Capture capability.
9
5.3 MODULE 3 - DISPLAY AND FRONT PANEL BUTTON
P
ARAMETERS (3-dSP)
PAR
Pro
Front Panel
Display
Select Enable
Display
Update Time
Front Panel
Reset Enable
Programming
Security Code
Zero Display
W/Display
Reset
3-dSP
dSP-t SEL rSt ZErO CodE
Display
Intensity
Level
d-LEVScroL
Display
Scroll
Enable
PARAMETER MENU
1
dSP-t
DISPLAY UPDATE TIME
This parameter sets the display update time in seconds.
1
0.5
2
seconds
The yES selection allows the SEL button to toggle through the enabled
displays.
FRONT PANEL DISPLAY SELECT ENABLE (SEL)
yES
SEL
yES NO
This parameter enables the RST button or user input to zero the input display
value, causing the display reading to be offset.
Note: For this parameter to operate, the RST button or User Input being used
must be set to dSP and the Input value must be displayed. If these conditions are
not met, the display will not zero.
ZERO DISPLAY WITH DISPLAY RESET
NO
ZErO
yES NO
The yES selection allows the display to automatically scroll through the
enabled displays. The scroll rate is every 4 seconds. This parameter only appears
when the MAX or MIN displays are enabled.
DISPLAY SCROLL ENABLE
NO
ScroL
yES NO
The Security Code determines the programming mode and the accessibility
of programming parameters. This code can be used along with the Program
Mode Lock-out (P-Loc) in the User Input Function parameter (Module 1).
Two programming modes are available. Full Programming mode allows all
parameters to be viewed and modified. Quick Programming mode permits only
the Setpoint values to be modified, but allows direct access to these values
without having to enter Full Programming mode.
Programming a Security Code other than 0, requires this code to be entered
at the CodE prompt in order to access Full Programming mode. Depending on the
code value, Quick Programming may be accessible before the CodE prompt
appears (see chart).
PROGRAMMING SECURITY CODE
000 to 999
Enter the desired Display Intensity Level (1-5). The display will actively dim
or brighten as levels are changed.
DISPLAY INTENSITY LEVEL
1 to 5
5
d-LEV
000
CodE
USER INPUT
FUNCTION
USER INPUT
STATE
SECURITY
CODE
MODE WHEN “SEL”
BUTTON IS PRESSED
FULL PROGRAMMING
MODE ACCESS
0
Full Programming Immediate Access
not P-Loc
______
1-99
Quick Programming
After Quick Programming
with correct code entry at
CodE prompt *
100-999
CodE prompt
With correct code entry
at
CodE prompt *
0
Programming Lock No Access
Active
1-99
Quick Programming No Access
P-Loc
100-999
CodE prompt
With correct code entry
at
CodE prompt *
Not Active 0-999
Full Programming Immediate Access
This selection allows the RST button to reset the selected value(s).
FRONT PANEL RESET ENABLE (RST)
dSP
rSt
HI-LO
LO
HI
NO dSP
10
0.0
tON-n
ON TIME DELAY
Enter the time value in seconds that the output is delayed from turning on
after the trigger point is reached. A value of 0.0 allows the meter to update the
output status per the response time listed in the Specifications.
0.0 to 599.9 seconds
0.0
tOF-n
OFF TIME DELAY
0.0 to 599.9 seconds
Enter the time value in seconds that the output is delayed from turning off
after the trigger point is reached. A value of 0.0 allows the meter to update the
output status per the response time listed in the Specifications.
Enter the reset action of the output. See figure for details.
Auto = Automatic action; This action allows the output to automatically reset off
at the trigger points per the Setpoint Action shown in Setpoint Output
Figures. The “on” output may be manually reset (off) immediately by the
front panel
RST button or user input.The output remains off until the trigger
point is crossed again.
LAtCH = Latch with immediate reset action; This action latches the output on at
the trigger point per the Setpoint Action shown in Setpoint Output Figures.
Latch means that the output can only be turned off by the front panel RST
button or user input manual reset, serial reset command or meter power cycle.
When the user input or RST button is activated (momentary action), the
OUTPUT RESET ACTION
LAtCHAuto L-dLY
Auto
rSt-n
OUTPUT
STATE
OFF
ON
Hys
SP + Hys
SP
OFF
TRIGGER POINTS
Low Acting (Unbalanced Hys) = LO-Ub
OUTPUT
STATE
OFF
ON
Hys
SP
SP - Hys
OFF
TRIGGER POINTS
High Acting (Unbalanced Hys) = HI-Ub
SETPOINT VALUE
Enter the desired setpoint value. The decimal point position for the setpoint
and hysteresis values follow the selection set in Module 1.
-19999 to 99999
100
SPt-n
2
HYS-n
HYSTERESIS VALUE
1 to 59999
Enter desired hysteresis value. See Setpoint Output Figures for visual
explanation of how setpoint output actions (balanced and unbalanced) are
affected by the hysteresis. When the setpoint is a control output, usually
balanced hysteresis is used. For alarm applications, usually unbalanced
hysteresis is used. For unbalanced hysteresis modes, the hysteresis functions on
the low side for high acting setpoints and functions on the high side for low
acting setpoints.
Note: Hysteresis eliminates output chatter at the switch point, while time delay
can be used to prevent false triggering during process transient events.
5.4 MODULE 4 - SETPOINT OUTPUT PARAMETERS (4-SPt)
PAR
Setpoint
Action
Setpoint
Select
Setpoint
Value
Output Reset
Action
Hysteresis
Value
Off Time
Delay
On Time
Delay
Output Reset
W/Display
Reset
SPSEL
4-SPt
Act-n SPt-n HYS-n tON-n tOF-n rSt-n rEn-n
Pro
Standby
Operation
Stb-n
Enb-n
Setpoint
Enable
PARAMETER MENU
Enter the setpoint (output) to be programmed. The n in the following
parameters will reflect the chosen setpoint number. After the chosen setpoint
is completely programmed, the display will return to SPSEL. Repeat steps for
each setpoint to be programmed. Select
NO to exit the module.
SETPOINT SELECT
NO
SPSEL
NO SP-1 SP-2
Select YES to enable Setpoint n and access the setup parameters. If NO is
selected, the unit returns to SPSEL and Setpoint n is disabled.
SETPOINT ENABLE
NO
Enb-n
YES NO
Enter the action for the selected setpoint (output). See Setpoint Output
Figures for a visual detail of each action.
SETPOINT ACTION
HI-Ub
Act-n
HI-bL LO-bL HI-Ub LO-Ub
High Acting, with balanced hysteresis
Low Acting, with balanced hysteresis
High Acting, with unbalanced hysteresis
Low Acting, with unbalanced hysteresis
=
HI-bL
=
LO-bL
=
HI-Ub
=
LO-Ub
OUTPUT
STATE
OFF
ON
Hys
SP + ½Hys
SP
SP - ½Hys
OFF
TRIGGER POINTS
High Acting (Balanced Hys) = HI-bL
OUTPUT
STATE
OFF
ON
Hys
SP + ½Hys
SP
SP - ½Hys
OFF
TRIGGER POINTS
Low Acting (Balanced Hys) = LO-bL
11
OUTPUT
STATE
OFF
ON
Hys
SP
Auto
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
MANUAL
RESET
LAtCH
L-dLY
SP - Hys
( )
( )
( )
{
Setpoint Output Reset Actions
This parameter enables the RST button or user input to reset the output when
the display is reset.
Note: For this parameter to operate, the RST button or User Input being used
must be set to
dSP and the Input value must be displayed. If these conditions are
not met, the output will not reset.
YES
rEn-n
OUTPUT RESET WITH DISPLAY RESET
YESNO
When YES, the output is disabled (after a power up) until the trigger point is
crossed. Once the output is on, the output operates normally per the Setpoint
Action and Output Reset Action.
NO
Stb-n
STANDBY OPERATION
YESNO
5.5 MODULE 5 - SERIAL SETUP PARAMETERS (5-SEr)
PAR
Data BitBaud Rate Parity Bit Print
Options
Meter
Address
Abbreviated
Printing
5-SEr
bAUd dAtA
PAr Addr Abbr
OPt
Pro
PARAMETER MENU
Module 5 is the programming module for the Serial Communications
Parameters. These parameters are used to match the serial settings of the LD
with those of the host computer or other serial device.
BAUD RATE
Set the baud rate to match that of other serial communications equipment.
Normally, the baud rate is set to the highest value that all of the serial
communications equipment is capable of transmitting and receiving.
9600
bAUd
9600
4800
38400
19200
2400600
1200300
corresponding “on” output is reset immediately and remains off until the
trigger point is crossed again. (Previously latched alarms will be off if power
up Display Value is lower than setpoint value.)
L-dLY = Latch with delay reset action; This action latches the output on at the
trigger point per the Setpoint Action shown in Setpoint Output Figures. Latch
means that the output can only be turned off by the front panel
RST button
or user input manual reset, serial reset command or meter power cycle. When
the user input or RST button is activated (momentary action), the meter
delays the event until the corresponding “on” output crosses the trigger off
point. (Previously latched outputs are off if power up Display Value is lower
than setpoint value. During a power cycle, the meter erases a previous
L-dLY
reset if it is not activated at power up.)
DATA BIT
Select either 7- or 8-bit data word length. Set the word length to match the
other serial communications equipment on the serial link.
7-bit
dAtA
8-bit7-bit
PARITY BIT
This parameter only appears when the Data Bit parameter is set to a 7-bit
data word length. Set the parity bit to match that of the other serial equipment
on the serial link. The meter ignores parity when receiving data and sets the
parity bit for outgoing data. If parity is set to NO, an additional stop bit is used
to force the frame size to 10 bits.
Odd
PAr
EVENOddNO
Sending Serial Commands and Data
When sending commands to the meter, a string containing at least one
command character must be constructed. A command string consists of a
command character, a value identifier, numerical data (if writing data to the
meter) followed by a command terminator character, * or $.
Command Chart
Command String Construction
The command string must be constructed in a specific sequence. The meter
does not respond with an error message to illegal commands. The following
procedure details construction of a command string:
1. The first 2 or 3 characters consist of the Node Address Specifier (N) followed
by a 1 or 2 character node address number. The node address number of the
meter is programmable. If the node address is 0, this command and the node
address itself may be omitted. This is the only command that may be used in
conjunction with other commands.
2. After the optional address specifier, the next character is the command
character.
3. The next character is the register ID. This identifies the register that the
command affects. The P command does not require a register ID character. It
prints all the active selections chosen in the Print Options menu parameter.
4. If constructing a value change command (writing data), the numeric data is
sent next.
5. All command strings must be terminated with the string termination
characters * or $. The meter does not begin processing the command string
until this character is received. See timing diagram figure
Register Identification Chart
Command String Examples:
1. Node address = 17, Write 350 to the Setpoint 1 value
String: N17VD350$
2. Node address = 5, Read Input, response time of 50 msec min
String: N5TA*
3. Node address = 31, Request a Block Print Output, response time of 2 msec min
String: N31P$
Transmitting Data to the Meter
Numeric data sent to the meter must be limited to transmit details listed in the
Register Identification Chart. Leading zeros are ignored. Negative numbers
must have a minus sign. The meter ignores any decimal point and conforms the
number to the scaled resolution. (For example: The meter’s scaled decimal point
position is set for 0.0 and 25 is written to a register. The value of the register is
now 2.5. In this case, write a value of 250 to equal 25.0).
Note: Since the meter does not issue a reply to value change commands, follow
with a transmit value command for readback verification.
12
ABBREVIATED PRINTING
This parameter determines the formatting of data transmitted from the meter
in response to a Transmit Value command or a Block Print Request. Select NO
for a full print transmission, consisting of the meter address, mnemonics, and
parameter data. Select YES for abbreviated print transmissions, consisting of the
parameter data only. This setting is applied to all the parameters selected in the
PRINT OPTIONS. (Note: If the meter address is 0, the address will not be sent
during a full transmission.)
NO
Abbr
YESNO
PRINT OPTIONS
This parameter selects the meter values transmitted in response to a Print
Request. A print request is also referred to as a block print because more than
one parameter can be sent to a printer or computer as a block.
Selecting
YES displays a sublist for choosing the meter parameters to appear
in the print block. All active parameters entered as
YES in the sublist will be
transmitted during a block print. Parameters entered as
NO will not be sent.
The “Print All” (P ALL) option selects all meter values for transmitting (YES),
without having to individually select each parameter in the sublist.
Note: Inactive parameters will not be sent regardless of the print option
setting. The Setpoint value will not be sent unless the setpoint is enabled
NO
OPt
YESNO
DISPLAY DESCRIPTION
FACTORY
SETTING
MNEMONIC
INP
Input
YES
INP
HI
Maximum
NO
MAX
LO
Minimum
NO
MIN
SPt-1
Setpoint 1
NO
SP1
SPt-2
Setpoint 2
NO
SP2
METER ADDRESS
Enter the serial node address. With a single unit, an address is not needed
and a value of zero can be used (RS232 applications). Otherwise, with multiple
bussed units, a unique address number must be assigned to each meter. The
node address applies specifically to RS485 applications.
00
Addr
0 to 99
Command Description Notes
N
Node (meter)
Address Specifier
T Transmit Value (read)
V Value Change (write)
R Reset
P
Block Print Request
(read)
Address a specific meter. Must be
followed by one or two digit node
address. Not required when node
address = 0.
Read a register from the meter. Must
be followed by a register ID character.
Write to register of the meter. Must be
followed by a register ID character and
numeric data.
Initiates a block print output. Registers
in the print block are selected in Print
Options.
ID Value Description MNEMONIC
Applicable
Commands
Transmit Details (T and V)
A Input INP T, R 5 digit
B Maximum MAX T, R 5 digit
C Minimum MIN T, R 5 digit
D Setpoint 1 SP1 T, R, V 5 digit positive/4 digit negative
E Setpoint 2 SP2 T, R, V 5 digit positive/4 digit negative
Reset a min or max value or the
output. Must be followed by a register
ID character
13
Command Response Time
The meter can only receive data or transmit data at any one time (half-duplex
operation). During RS232 transmissions, the meter ignores commands while
transmitting data, but instead uses RXD as a busy signal. When sending
commands and data to the meter, a delay must be imposed before sending
another command. This allows enough time for the meter to process the
command and prepare for the next command.
At the start of the time interval t
1
, the computer program prints or writes the
string to the com port, thus initiating a transmission. During t
1
, the command
characters are under transmission and at the end of this period, the command
terminating character (* or $) is received by the meter. The time duration of t
1
is dependent on the number of characters and baud rate of the channel.
t
1
= (10 times the # of characters) / baud rate
At the start of time interval t
2
, the meter starts the interpretation of the
command and when complete, performs the command function. This time
interval t
2
varies. If no response from the meter is expected, the meter is ready
to accept another command.
If the meter is to reply with data, the time interval t
2
is controlled by the use
of the command terminating character. The ‘*’ terminating character results in
a response time of 50 msec. minimum. This allows sufficient time for the
release of the sending driver on the RS485 bus. Terminating the command line
with ‘$’ results in a response time (t
2
) of 2 msec. minimum. The faster response
time of this terminating character requires that sending drivers release within 2
msec. after the terminating character is received.
At the beginning of time interval t
3
, the meter responds with the first
character of the reply. As with t
1
, the time duration of t
3
is dependent on the
number of characters and baud rate of the channel. At the end of t
3
, the meter is
ready to receive the next command.
t
3
= (10 times the # of characters) / baud rate
The maximum serial throughput of the meter is limited to the sum of the
times t
1
, t
2
and t
3
.
Ready Ready
1
t t
2
Ready
t
1
t
2
Ready
t
3
Command
String
Transmission
Meter
Response
Time
Command
Terminator
Received
First
Character
of Reply
Reply
Transmission
NO REPLY FROM METER
RESPONSE FROM METER
Time
Timing Diagram Figure
Receiving Data From The Meter
Data is transmitted from the meter in response to either a transmit command
(T), a block print request command (P) or a User Input print request. The
response from the meter is either a full field transmission or an abbreviated
transmission, depending on the selection chosen in Module 5.
Full Field Transmission
* These characters only appear in the last line of a block print.
The first two characters transmitted are the meter address. If the address
assigned is 0, two spaces are substituted. A space follows the meter address field.
The next three characters are the register mnemonic, as shown in the Register
Identification Chart.
The numeric data is transmitted next. The numeric field (bytes 7 to 15) is 9
characters long. This field consists of a minus sign (for negative values), a
floating decimal point (if applicable), and five positions for the requested value.
The data within bytes 9 to 15 is right-aligned with leading spaces for any
unfilled positions. When a requested value exceeds the meter’s display limits,
decimal points are transmitted instead of a numeric value.
The end of the response string is terminated with a <CR> and <LF>. After the
last line of a block print, an extra <SP>, <CR> and <LF> are added to provide
separation between the print blocks.
Abbreviated Transmission
* These characters only appear in the last line of a block print.
The abbreviated response suppresses the node address and register ID,
leaving only the numeric part of the response.
Meter Response Examples:
1. Node address = 17, full field response, Input = 875
17 INP 875 <CR><LF>
2. Node address = 0, full field response, Setpoint 1 = -250.5
SP1 -250.5<CR><LF>
3. Node address = 0, abbreviated response, Setpoint 2 = 250, last line of block
print 250<CR><LF><SP><CR><LF>
9 byte data field; 7 bytes for number, one byte for sign, one byte for
decimal point
<LF>* (line feed)20
<CR>* (carriage return)19
<SP>* (Space)18
<LF> (line feed)17
<CR> (carriage return)16
7-15
3 byte Register Mnemonic field4-6
<SP> (Space)3
2 byte Node Address field [00-99]1, 2
DescriptionByte
<LF>* (line feed)14
<CR>* (carriage return)13
<SP>* (Space)12
<LF> (line feed)11
<CR> (carriage return)10
9 byte data field, 7 bytes for number, one byte for sign, one
byte for decimal point
1-9
DescriptionByte
14
Communication Format
Data is transferred from the meter through a serial communication channel.
In serial communications, the voltage is switched between a high and low level
at a predetermined rate (baud rate) using ASCII encoding. The receiving device
reads the voltage levels at the same intervals and then translates the switched
levels back to a character. The voltage level conventions depend on the interface
standard. The table lists the voltage levels for each standard.
Data is transmitted one byte at a time with a variable idle period between
characters (0 to
). Each ASCII character is “framed” with a beginning start bit,
an optional parity bit and one or more ending stop bits. The data format and
baud rate must match that of other equipment in order for communication to
take place. The figures list the data formats employed by the meter.
Start Bit and Data Bits
Data transmission always begins with the start bit. The start bit signals the
receiving device to prepare for reception of data. One bit period later, the least
significant bit of the ASCII encoded character is transmitted, followed by the
remaining data bits. The receiving device then reads each bit position as they are
transmitted.
Parity Bit
After the data bits, the parity bit is sent. The transmitter sets the parity bit to
a zero or a one, so that the total number of ones contained in the transmission
(including the parity bit) is either even or odd. This bit is used by the receiver
to detect errors that may occur to an odd number of bits in the transmission.
However, a single parity bit cannot detect errors that may occur to an even
number of bits. Given this limitation, the parity bit is often ignored by the
receiving device. The meter ignores the parity bit of incoming data and sets the
parity bit to odd, even or none (mark parity) for outgoing data.
Stop Bit
The last character transmitted is the stop bit. The stop bit provides a single bit
period pause to allow the receiver to prepare to re-synchronize to the start of a
new transmission (start bit of next byte). The receiver then continuously looks
for the occurrence of the start bit. If 7 data bits and no parity is selected, then 2
stop bits are sent from the meter.
Character Frame Figure
LOGIC RS232* RS485*INTERFACE STATE
1 TXD,RXD; -3 to -15 V a-b < -200 mVmark (idle)
0 TXD,RXD; +3 to +15 V a-b > +200 mVspace (active)
* Voltage levels at the Receiver
15
Setpoint
Action
Setpoint
Select
Setpoint
Value
Output Reset
Action
Hysteresis
Value
O Time
Delay
On Time
Delay
Output Reset
W/Display
Reset
SPSEL
4-SPt
Act-n SPt-n HYS-n tON-n tOF-n rSt-n rEn-n
Standby
Operation
Stb-n
Front Panel
Reset Enable
Front Panel
Display
Select Enable
Display
Update Time
dSP-t SEL rSt
3-dSP
Display
Intensity
Level
d-LEV
Programming
Security Code
CodE
Filter Band
Input
Range
rANGE
Display
Decimal Point
dECPt
1-INP
Filter Setting
FILtr
bANd
USrIN
User Input
Function
Input Value
for Scaling
Point 1
INP 1 dSP 1
INP 2
U-ASN
User Input
Assignment
LO-En
Min Display
Enable
Max Capture
Delay Time
Max Display
Enable
HI-En HI-t2-SEC
Min Capture
Delay TIme
LO-t
Factory
Service
Operations
FCS
Access Code
For Service
Operations
CodE
PAr
Parity BitBaud Rate
bAUd
Data Bit
dAtA
5-SEr
Meter
Address
Addr
Abbreviated
Printing
Abbr
Print
Options
OPt
PAR
SEL
NO
Pro
Exit
Programming
End
PAR
SEL
SEL
SEL
SEL
SEL
PAR
PAR
PAR
PAR
Display Value
for Scaling
Point 1
Input Value
for Scaling
Point 2
Display Value
for Scaling
Point 2
dSP 2
OFSEt
Display Oset
Value
StYLE
Scaling Style
Zero Display
W/Display
Reset
ZErO ScroL
Display
Scroll
Enable
Enb-n
Setpoint
Enable
User Input
Active Level
U-ACt
LDA PROGRAMMING QUICK OVERVIEW
Press PAR key to enter
Programming Mode.
LIMITED WARRANTY
The Company warrants the products it manufactures against defects in materials and workmanship
for a period limited to two years from the date of shipment, provided the products have been stored,
handled, installed, and used under proper conditions. The Company’s liability under this limited
warranty shall extend only to the repair or replacement of a defective product, at The Company’s
option. The Company disclaims all liability for any affirmation, promise or representation with
respect to the products.
The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify RLC against
damages, claims, and expenses arising out of subsequent sales of RLC products or products
containing components manufactured by RLC and based upon personal injuries, deaths, property
damage, lost profits, and other matters which Buyer, its employees, or sub-contractors are or may be
to any extent liable, including without limitation penalties imposed by the Consumer Product Safety
Act (P.L. 92-573) and liability imposed upon any person pursuant to the Magnuson-Moss Warranty
Act (P.L. 93-637), as now in effect or as amended hereafter.
No warranties expressed or implied are created with respect to The Company’s products except those
expressly contained herein. The Customer acknowledges the disclaimers and limitations contained
herein and relies on no other warranties or affirmations.
Red Lion Controls
Headquarters
20 Willow Springs Circle
York PA 17406
Tel +1 (717) 767-6511
Fax +1 (717) 764-0839
Red Lion Controls
China
Unit 101, XinAn Plaza
Building 13, No.99 Tianzhou Road
ShangHai, P.R. China 200223
Tel +86 21 6113-3688
Fax +86 21 6113-3683
Red Lion Controls
Europe
Printerweg 10
NL - 3821 AD Amersfoort
Tel +31 (0) 334 723 225
Fax +31 (0) 334 893 793
Red Lion Controls
India
54, Vishvas Tenement
GST Road, New Ranip,
Ahmedabad-382480 Gujarat, India
Tel +91 987 954 0503
Fax +91 79 275 31 350
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